const {readFile} = require('fs')
const EventEmitter = require("events")

class EE extends EventEmitter{}

const yy = new EE()

yy.on("event", ()=>{
    console.log('event')
})

setTimeout(()=>{
    console.log("0毫秒后的回调")
},0)
setTimeout(()=>{
    console.log("100毫秒后的回调")
},100)
setTimeout(()=>{
    console.log("200毫秒后的回调")
},200)

